It's hard to keep up with them these days.
GOG.com are having a sale on Sci-Fi space Simulators:
All great games, all very cheap. I have a friend who credits Descent for teaching him how to visualise 3D space; he now designs and models 3D effects.
To celebrate free DLC The Passing,
Left 4 Dead 2 is 33% cheaper on Steam at £13.39/$20.09 four pack is £40.19/$60.29 Or you can buy the first and second game
together for £26.79/$33.49
Also, this:
Call of Duty Modern Warfare is half price at £9.99/$14.99 on steam. It's the game of the year edition.
Trine is still £4.25/$5 on steam.
And Direct2Drive's
sale is still on, of course.
EDIT: more!
Zombie Driver is half price on Gamer's Gate - £3.97/$4.97.
King's Bounty Gold (first and second game) is 66% cheaper on Impulse - £11.88/$14.99
BUY IT.
The Painkiller games are 40% off - £8.97/$11.97 on Gamer's Gate. Enjoyably dim, made by the guys who are making Bulletstorm